Automatic Transmission Sensor Calibration Logic
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Solution Overview
Problem
The existing methods for calibrating position detection sensors in automatic transmissions are either time-consuming or prone to being unnecessary, especially after service or repair, which can slow down transmission power-up and may lead to measurement errors due to the lack of automatic calibration strategies.
Innovation Solution
An automatic calibration method for position detection sensors that registers the gearshift actuator positions upon power-up and performs calibration only if the registered positions are outside predetermined expected or abnormal ranges, reducing the risk of unnecessary calibrations and improving start-up times by ensuring calibration is only performed when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed upon every power-up of the transmission, then measurement precision of the position detection sensor is improved, but start-up time is increased
Solution Approach 1:
The patent applies partial action by performing calibration only when necessary (when gearshift actuator positions are abnormal or after service/repair) rather than at every power-up. This selective calibration approach maintains measurement precision when needed while avoiding unnecessary calibration operations that would increase start-up time during normal operation.
Solution Approach 2:
The system changes the calibration frequency parameter dynamically based on operational conditions. Instead of a fixed calibration schedule, the calibration is triggered by parameter changes such as abnormal gearshift actuator positions, service/repair events, or transmission control unit replacements, thereby optimizing the balance between precision and time.
2Productivity
If calibration is skipped to reduce start-up time, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The system uses feedback from position detection sensors to monitor gearshift actuator positions and determine whether calibration is needed. By continuously monitoring actual positions and comparing them against expected ranges, the system can identify when calibration has drifted and is required, ensuring measurement precision is maintained without unnecessary calibrations that would reduce productivity.
Solution Approach 2:
The transmission control unit automatically determines when calibration is needed based on monitored parameters and service/repair events, eliminating the need for manual intervention. The system self-regulates calibration frequency based on its own operational state, maintaining precision while optimizing start-up speed.
3Ease of operation
If manual calibration procedures are used, then ease of operation is reduced, but device complexity is decreased
Solution Approach 1:
The system performs automatic calibration determination and execution based on monitored parameters and trigger conditions. The transmission control unit automatically identifies when calibration is needed, executes the calibration routine, and updates the position detection sensor reference values without requiring manual operator intervention, thereby improving ease of operation despite increased device complexity.
Solution Approach 2:
The system performs preliminary monitoring of gearshift actuator positions and service/repair events to determine calibration needs before actual calibration is executed. This preliminary detection and automatic initiation of calibration simplifies the operator's task by eliminating manual assessment and preparation steps.
Data Source
AI summary
A method for automatic calibration of a position detection sensor of an automatic transmission including a gearshift actuator, the method including registering, using the position detection sensor, the position of the gearshift actuator upon power-up of the transmission; and performing a calibration of the position detection sensor if the registered position of the gearshift actuator is outside a predetermined expected position range of the gearshift actuator or within a predetermined abnormal position range of the gearshift actuator.